We have the mail version that came with OS X 10.2.3 (can't remember what breed of cat that is)
That's Mail 1.2.5 (V553) - ok it's old!.
I recently set up our account preferences but screwed up on the outgoing mail server on the first couple of tries.
After it didn't work I deleted that account and started again.
Trouble is -"Mail" kept those servers on file so there are about five of them in there - The correct one is mail.earthlink.net, but there is also smtpauth.earthlink.net, and about three others. No matter what I do it won't retain the correct one as it's first choice when sending mail. It tries one that does not work then asks if I want to try the next one. I have to pick mail.earthlink.net out of the list then it will send the mail.
How do I clear the list of the incorrect servers? As I mentioned, removing the account and starting a new one only compounds the problem ! ARRRRGGGHH!
Kent